Guillotine knife-automatic electrical back gauge



Feb. 17, 1953 F. w. SEYBOLD Z628680 GUILL.OTINE KNIFE-AUTOMATICELECTRICAL BACK GAUGE Filed Sept. 2, 1949 4 Sheets-Sheet l FIG. I.

INVENTOR FREDERICK W. SE YBOLD ATTORN EYS Feb. 17, 1953 F. w. SEYBOLD2628680 GUILLOTINE KNIFE-AUTOMATIC ELEZCTRICAL. BACK GAUGE Filed Sept.2, 1949 4 Sheets-Sheet 3 INVENTOR ATTORNEYS F. W. SEYBOLD Feb. 17, 1953GUILLOTINE KNIFE-AUTOMATIC ELECTRICAL BACK GAUGE 4 Sheets-Sheet 4 FiledSept. 2, 1949 PHQTOELECT. RELAY KPLUGGING SWITCH REV.

OL OL FOR.

COIL OF SOLENQID STARTER FAST F'IG. 8.

INVENTOR F'FIEDERICK w. sevsou ATTORNEYS Patentecl Feb. 17, 1953GUILLOTINE KNIFE-AU'IOMATIC ELEC- 'IRICAL BACK GAUGE Frederick W.Seybold, Westfield, N. J assignor to E. P. LawsonCo. Inc., New York, N.Y., a col poration of New York Applicaton September 2, 1949, Serial No.113,717

Claims.

My present inventon=relates te electricaiiy operated autometic spacingmechanism and more partcularly to en automatic spacing mechanismspecifically designed 'IOr use in connection with guiilotine typepapercutters.

In the operationof .guillotine type paper cutters, a pi1e of paperisplaced en the work tabie beneath the cutting knife. The backgaugeusually provided on the work tab1eis then adjusted so that the portionof the piiewhich it is desired to cut off extends forward of the ci1ttngknife edge so that when the knife is brought down, it Wil! cut o anexactly dimensioned Section of the pi1e.

In operating paper cutters of this type, thereicre, it requently becomesnecessary to adjust the back gauge many times for different cuts whichare te be made. Even 11 a plurality of regular cuts is to be made from asingle pi1e, the back gauge must be moved up each time in order toensure that the edges are perfectiy squared so that the exact cut may bemade.

The object of my invention is the provison of a nevel automatc backgauge spacing mechanism whch wi1i adjust the back gauge at Successiveindividually predeterniined intervals after successive cuts.

By the use of my inventon, therefore, the operator need do nothing morethan p1a ce the niti a1 pi1e of paper on the machine against the backgauge and then operate the paper cutter so that the knife moves up anddown a desired number of times te out the desirednumber of pi1es.

The back gauge automatic spacing mechanism automaticaiiy moves the backgauge the proper distance at the end of each cut and before the next cutis started.

Automatic operation or spacing of the back games is already known asshown in the prior Patent No. 2,053499.

My invention is directed specificaily to automatic electrical controlelements for successively movine the back gauge by predetermnedintervals after individual cuts.

Essentially, my invention contemplates the utiiization of a carriagemoving transversely across the front of the machine in synchronism withthe movement of the back gauge and for equal distances.

A photo-sensitive medium, such as a photoelectric tube, and a lightsource ere borne by the cerriage across the front of the machine. Anindicator or regulating strip is located between the light source andthe photo sensitve medium.

In its simplest form, theindicator or reguiating strip is provided with"a plurality of successive rectanguiar openings, the 1eft-hand edges of2 whch are each spaced from each other by the exact distance which theback gauge is to travel between successive cuts.

Eiectric'ally controiled drivng mechanism is provided for the backgauge, this driving mechanism being in turn controlled by the manner inwhich light fal1s on the photo-sensitive medium.

When the operation of the back gauge is initiated, 'ths operation cakesplace at u1 speed to drite the back gauge orward rapidly at the sametime as the carriage is driving transversely at equai speed.

When light from the light source first passes t'nrough ons of therectangular openings on the indicator strip, circuits are eperated toreduce the forward speed of the back gauge anti a1so at the cerriage.

When the 1ight from the light source is then cut 0 by the ieft-hand edgeof the opening, the back gauge and the carriage are halted in theirmovement.

Thus, a heavy pi1e of paper may be brought up rapidiy by the back gaugete near the point where it is te be stopped. Thereafter it is sloweddown and then fina11y brought to a stop. The -s1ow down intervalprevents a sudden stop of the back gauge from causing e paper pile tocross beyond the predetermined position.

Thus, the fina1 speed of the back gauge and its carriage may be as 1itteas 1% of the speed at which the paper pi1e is brought up to close to thestopping point.

'I'hus, the width of the rectangular openings need not be more thanone-eighth or one-quarter of en inch in order te ensure that the paperpile is slowed down suflciently so that it will be stopped accurately.

The primery object of my invention, therefore, is the provision of novelback gauge control means wherein electricaly operated Or controlleddrving elements are in turn controlled by a. photc-sensitive medium andlight source moving synchronousiy with the back gauge and so arrangedthat the first change in the light condition after the initiation ofoperation wi1l cause the back gauge te be slowed down and the secondchange in the light condition after initiation of the operation wil1cause the back gauge to be stopped.

Whi1e a strip may be used for each run with openines perforated therein,it will be obvious that sliding plates may be used movable egeinst thesca1e to determine the position of the various rectangular openings andalso that various sliding elements inciuding pointers may be used todetermine the position of the various stops.

Where pointers a1fe used, then the circuit may be arranged so that thedarkening of the photosensitive medium will cause a slow down and therelighting of the photo-sensitive medium wil! cause a stop.

Preferably, the initiation of the operation is so arranged that thelifting of the kniie and clamp clear of the paper pile wil1 set theapparatus in motion, although a by-pass switch may be provided so thatthe back gauge may be set in motion manually when desired.

In order to perform this operation, preferably two electrical motors areprovided connected by planetary gear arrangements in such marmer thatwhen the motors are turning at a predetermined speed in the samedirection they wi1l produce a net high forward speed.

The change in the light condition upon the photocell wi1l operate a poiechanging switch to reduce the speed of ons of the motors, therebyproducing a very small net forward speed, and. a second change in thelight conditicn on the photocell wi1l halt both motors.

In addition, when the back gauge has reached its ful1 forward position,a solenoid operated clutch may be utilized to permit a reversal and fastreturn of the back gauge.

This may be accomplished eiectricaly or preferably by a mechanicalclutch reversing mechanism energized by a solenoid which is operatedwhen the reversing switch is closed.

Thus, additional objects of my invention are the utilization of twomotors for driving my back gauge in the forward direction with meansprovided for reducing the speed of one of the motors to reduce the highspeed to a low speed and by further means for halting both motors atthestopping position.

Anther object of my invention is the provision of nevel back gaugeregulating and indicating mechanism, including light sensitive means todetermine the slow down and stopping position of the back gauge.

The foregoing and many ether objects of my invention will becomeappa'rent in the fo1lowing descrptiori a nd drawings in which:

Figure 1 is a schematic view in perspective of my nove1 automatic baekgauge spacer.

Figure 2 is an end view of the drive members taken from line 2-2 ofFigure 1 looking in the direction of the arrows.

Figure 3 is a top view of the drive elements of Figure 2.

Figure 4 is a cross-section taken on line 4 of Figure 2 looking in thedirection of the arrows.

Figure 5 is a cross-sectional view taken on line 5-5 of Figure 4 lookingin the direction of the arrows.

Figure 6 is a cross-sectional view taken on line 6-6 of Figure 4 lookingin the direction of the arrows.

Figure 7. is a cross-sectonal view taken on line 'I-'l of Figure 4looking in the direction of the arrows.

Figure 8 is a circuit diagram of the connections for operating mynovelautomatic spacer.

Referring first to Figure 1, the cutter comprises a bed or tab1e 100 andframe HH carrying a knife [132 and a clamp I3 operating in the mannerdescribed in my application Serial No. 2,347, filed January 15, 1948,now Patent No. 2,487,031.

A back gauge 6I is provided driven by the screw l0 which is threadedinto a nut 62 integral with the back gauge. The direction of pulley 27by the screws 28.

4 movement of the back gauge depends upon the direction of rotation ofthe screw ID. Secured to screw I0 (Figure 4) by means of feather key His the planetary gear arm 2, which is provided with studs I3. Compoundplanetary pinions M, 11% are journalled on studs 3. Planet gears l4 meshwith sun gear IS. Gear |6 is provided with a long hub I, into the boreof which is fitted the bushing H3. The casing 19 is provided with a hub20 which is secured to the hub I'I by means of screws i. A V-belt pulley22 is fastened to the casing 19 by the screws 23 and a hall hearing 24journals pulley 22 on the hub !2a of the planetary gear arm l2.

Planet gears I5 mesh with the sun gear 25 which is secured to the longhub 25 of V-belt A bushing 29 is pressed into hub 26, and the sun gear25' and. provides a hearing on the screw H3 which is journalled in thelong bushing 33 of the bracket 3! which is fastened to the underside ofthe table and on the upperside of which the back. gauge B! moves forwardor backward.

V-belt pulley 21 is driven by motor pulley 33 (Figure 2) and belt 33a onthe single speed reversible motor 34. V-belt pulley 22 is driven by thepulley 35 and belt 35a on the two-speed reversible motor 36.

Pulley 35 has two sheaves 3% and 35e (Figures 2 and 3). The outsidesheave 3ic drives the plugging switch 31. The inside sheave 3511 drivespulley 22 through belt 3501.

The following transmission train, the function of which will be hereaterdescribed, is also provided:

A second motor pulley 3 (Figures 2 and 3) on motor 34 through belt 3adrives the V-belt pulley 33 keyed on the shaft (Figure which isjournalied in the hearing 6! and in the long bore 2 of the clutch geer3. This gear is journalled in hearing which is provided in the swingingarm d5 suspended from the long bushing 30 of the bracket 3. Clutch gear43 has jaw clutch teeth 46 which mate with the teethof the jaw clutchl'! which is longitudinally slidably mounted on key 48 of the shaft 45.

A compression spring 49 between the clutch 47 and collar 543 fastened tothe end of shaft 40 urges the clutch into engagement with clutch teeth45.

A solenoid 5! having an armature 51a and mounted on bracket 52 securedto the swinging arm 35 by bolts 52a cooperates through the levers 53pivoted at 56 on the bracket 52 to disengage the clutch 41 from theclutch teeth 46 when the solenoid is energized.

An idler gear 55 is free to rotate on fixed stud 5% in bracket 45 andmeshes with clutch gear 53 and gear 51 which is secured by screws 58 tothe inner member of a one-way clutch 59 (see also Figure 6). The outermember of said oneway or over-rum1ing clutch is secured to the V-beltpulley 22.

A second one-way or over-running clutch 60 (see a1so Figure 5 as well asFigure 4) is incorporated between the sun gear 25 and sun gear E6; itsfunction w1l also be hereinafter described.

For theconvenience of the operator in making a set-up for the step bystep movement of the back gauge 6l, said movement is transferred to acarriage 63 (Fgure 1) which traverses on a rectangular bar 64 supportedon -brackets 65 and 66. These brackets are securedto the frame 101 ofthe paper cutting machine by screws orin any other suitabie manner.

Secured to the back gauge 6| is an upright bar 68 to which are fastenedthe cable ends 69 and 10.

The cab1e from end 69 passes horizontally over sheave 'H on bracket '12and thence to sheave 13 on bracket "ii fastened. to the frame of themachine. It continues over one of the horizontal sheaves 15a and on tovertical sheave '16 and terminates at the carriage 63.

The cable fromena passes horizontailyover the other sheave 75b andcontinues to the right to vertical sheave 'i'1 and also .terminates atthe carrage 63.

In this manner, the carrage 63 duplicates the movement of the backgaugei. e. when the back gauge is all the way back, the carriage 63 willbe over to the right-handside and as the back gauge 6I moves forward,the carriage 63 wi11 move to the 1eit.

Supported on the carriage 63 is a photo-tube and a iight source '59.Between them passes the removable or adjustable stationary strip 66 inwhioh rectangular openings 8! of suitable width are out to correspond tostopping positions for the back gauge 6I.

Various slide members, markers or pointers may be used in place of strip80 to create the openings 61 at desired intervals. Or indvidual stripsmay be provided with openings cut at appropriate intervals or each run.Preferably strip 86 is equal in 1ength to the length of travei of backgauge 61.

The righthand vertical edge of each rectangu- 1ar opening 81 serves asthe signal which the photo-tube 'l'8 receives to throw the motor 36 fromits high speed into its 10W speed condition, thereby producing a verys1ow speed through the gearing of the transmission.

After the photo-tube has traversed the open space of the rectangle, theleft-hand edge of the rectangle wi1l then cut off the iliumnation fromthe photo-tube and this serves as the signal for plugging motor 36 andalso stopping motor 34.

It is important that both motors come to a stop at the same time. Thereis a tendency for motor 36 to s1ow down faster than motor 34 because itsspeed drops rom about 850 R. P. M. to zero, whereas the speed of motor34 drops from 1750 R. P. M. to zero. In order to prevent this, geertrain 43-55-53 is provided with the one-way or over-running; c1utch 56,the latter permitting pulley 22 to turn faster tiran gear 51; but thespeed of pul1ey 22 cannot fa11 below that of motor 36 from dropping attoo:great a speed, the

gear train 43-56-51 acts as e. brake on the motor 36; that is, theoverrunning c1utch 59 wiii permit the motor 36 to turn at a higher ratethan motor 34 but it wi1l preventthe speed of motor 36 from droppingbe1ow the speed of the gear 51 to which the over-running c1utch orone-way clutch 59 is astened and thereby a reversal of the scre w |6 isprevented.

The gear 63 is provided With clutch teeth 46 and when the back gauge 61is to -be returned to its rearmost position, the clutch 47 must bedisconnected rom the clutch teeth 46 because the gaar ratio. whennowgear'l is drivinggear43,

the pulley 39 "W01'11d be turning more than two times as fast as themotor pulley 27, and this would produce too great a 1oad on the drivingmechanism.

Therefore, the solenoid 5! is provided which acts through the lever-53to disengage the clutch 41 from the teeth 46 when the back gauge is tebe returned just prior to the engagement of the reversng contactor whichwi1l move the back gauge to the rearmost position.

In a similar manner, the one-way c1utch 66 prevents the smaller motor 34from over-running or turning faster than the motor 36 when both motorsare operating in a reverse direction.

In otherwords, oneway ciutch 59 acts as a brake on motor 36 when thespeed of motor 35 is dropping from its highspeed in the forwarddire0tion, while one-way clutch 60 prevents the motor 34 fromover-running motor 36 when they are turning in the reverse direction andooming to a stop.

In this way, both motors are mechanicaliy connected because it is notpossible to plug stop two motors with one plugging switch, nor is itpossibie to have a plugging switch on each motor and have them actidentically alike so that both motors arrive at zero speed at the sameinstant, which is important in order to produce accu1acy of stopping ofthe screw H1.

By this means, the back gauge 6! is nst slowed down as the light from1ight source 79 passes through an opening 8! on to photo-tube 73 and. isstopped when the light source is cut off by the edge of opening 8l.

'Ihus, the back gauge 6! and carriage 53 are first moved rapidly to nearthe stopping position, slowed down near the stopping position and then-accurately stopped. Over-running or coasting of the paper pi1e is thusprevented and speed and accuraoy are retained.

The term plugging when used with alternating ourrent motors means thatwhen a motor is turning in a elockwise direction and then the rotationof the synchronous fie1d is reversed, which means that there is a 200%slip on the rotor this wi11 bring about a quick stop of said rotor andat the time when the rotor approaches zero speed, the contactor isautomaticaily opened by a device ca11ed a plugging switch.

The operation of the device is schematcally shown in the eiementarycircuit diagram of Figure 8.

It should first be pointed out that the forward operation of the backgauge is preferably initiated by a switch operated at the upper portionof the return stroke of the knife and clamp so that, as socn as a out isfinished, the operation of the back gauge te thenext step is begun. Theoperation rnay also be initiated by a manually operated button In thecircuit diagram of Figure 8, it is to be observed that the Fastcontactor of the pole changing switch is in, a circuit being establishedfrom L!-R3 (norma1ly closed) Fast coii, OLL to L3.

The reason for this is to gain time in starting so that when the Forwardcoil of the reversing starter is energized the time lag for bringing inthe Past ooi] is eliminated, and bcth motors begin to rotate at the sametime.

When the forward button A is depressed, the following circuit isestabiished-Ll-Stop Rev.FWDR4Ri-For. L. S.OLOL OL--OLL3.

As a result, the normally openeontacts R1 close and the Forward coil ofthe reversing starter becomes energized and then both motors 34 and 35start up in the forward direction.

Upon release of the Forward button, current is maintained throughLlStopRev. JOg/RunRI-RQFORFOL L. SOL-OL OLOLL3.

The same program can be carried out when the (Jam L. S. is depressedinstead of the Forward button.

Assuming that the photo-tube is traveliing dark in high speed and lightstrikes the tube through one of the rectangular openings 81 describedpreviously and as a result the photo-tube relay energizes relayR3,closing the normally open contacts R3 and opens the normally closedcontact R3 of the Past circuit, a circuit is now established-Li-R3Slow-OLOLLS In other words, the two-speed motor 36 now operates in slowspeed, while motor 34 continues in high speed.

After a short travel in slow speed, the rec tanguiar opening againdarkens the photo-tube. ihe normally open contact Slow was closed at thetime the Slow speed circuit was made and when the photo-electric relayis returned to its original position (dark) coil R4 becomes ener gizeand opens the normally closed contact Ri, thereby breaking the holdingcircuit of the Forward coil.

While the Forward ci1 was energized, the normally closed contact POR inthe plugging circuit was opened and now when the Forward coi1 isdeenergized this FOR contact returns to its normaliy closed condtion,thereby estabiishing the following circuit-LIFOR (of PluggingSwitch)-FORRev.-Rev. L. S.OIr OLOL-OLL3. The motor terminals havethereby been reversed and 200% slip between the motor rotor and thestator brngs about a rapid deceleration of the rotors of both motors andwhen the speed of the rotors drops to a speed corresponding to theadjustment of the plugging switch, its contacts open and drop out theplugging switch contactor and both motors come to a standstill.

After the back gauge has advanced step by step and has reached. its lastrequired forward positi0n, the gauge may be returned to the rear bydepressing the Reverse button, whereby the following circuit will beestablished-Ll-Stop- FOR (N. C.)Rev (N. O.)R2-Rev. L. S.-OL OL-OLOL-L3.

The 0011 of the solenoid starter Will also loc energized and therebyclose the solenoid contactors energizing the solenoid 5! and diseng-agethe clutch #51.

The N. 0. contactors R2 wil1 now be closed, maintaining current on coi1R2 and as a result the Reverse coil of the reversing starter will becomeenergized and close the contacts for the reverse operation of bothmotors.

'ihe reverse -plugging circuit is now inoperative because the N. C. Rev.contactor is opened, but as soon as the Stop button is depressed or theRev. limit switch is opened, the Reverse cci1 and R2 coil becomede-energized, dropping out both R2 contactors and the Rev. coil of thereversing starter, permittng the N. G. Rev. contactor of the pluggingcircuit to close and establish a circuit through the Forward coil of thereversing starter, whereby the motor terminals hecome again reversed andlering about a rapid deceleration, as described above, and both motorscome to a quick stop.

In the foregoing I have described my invention so1ely in connection withspecific illustrative ernbodiments thereof. Since many varations andmodifications of my invention will now become obvious to those siri1iedin the art, I prefer to be bound not by the specific disclosures hereincontained but only by the appended claims.

I claim:

1. A movable back gauge for a cutting machine having a reciprocatingknife, drive apparatus for stepping said back gauge to a plurality ofpreselected successive positions, said apparatus including a drive motorand a shaft connected between said drive motor and said back gauge;control means responsive to the approach of said back gauge to aselected position to reduce thespeed of said shait ancl said back gauge,said control means being responsive to the arrival of the back gauge ata selected position to halt said shaft; said control means including aphoto sensitive member movable synchronously with said back gauge; asource of 1ight; and. light control elements at each selected stopposition cooperating with said photo-sensitivo member; said controlmeans inchiding a photo-sensitive member and a light source movablesynchronously with said back gauge; an opaque member between said iightsource and said photo-sensitive member; openings in said opaque memberat each successive stop position; circuit connections between saidphoto-sensitive member and said drive motor responsive to impingement oflight on the photo-sensitive member te slow said drive shait andresponsive to sulosequent interception of light by said opaque member tohalt said drive shaft, and additional means for initiating the movementof said back gauge following a halt thereof.

2. A movabie back gauge or a cutting machine having a reciprocatingknife, drive apparatus for stepping said back gauge to a plurality ofpre-seiected successive positions, said apparatus including a drivemotor and a shaft connected between said drive motor and said backgauge; control means responsive to the approach of said back gauge to aselected position to reduce the speed of said shait 2t1l51 said backgauge, said control means being responsive to the arrival of the backgauge at a selected position to halt said shaft; said control meansinciuding a p hoto-sensitive member movable synchronously with said backgauge; a source of light; and light control elements at each selectedstop position cooperating with said photo-sensitive member; said controlmeans including a photo-sensitive member and a light source movablesynchronously with said back gauge; light control means between saidlight source and said photo-sensitive member; elements on said lightcontrol means permitting a passage of light and other elementsintercepting light; at least certain boundaries between said elements ofopposite characteristics being located at the stop positions of the backgauge and the photo-sensitive member.

3. A movable back gauge for a cutting machine having a reciprocatingknife, drive apparatus for stepping said back gauge to a plurality ofpre-selected successive positions, said apparatus including a drivemotor and a shaft connected between said drive motor and said backgauge; control means responsive to the approach of said back gauge to aselected position to reduce the speed of said shaft and said back gauge,said contro1 means being responsive to the arrival of the back gauge at"aseieoted:pbsition.to haltsaid shait; said control means nciding aphoto-sem sitive member movable synchronousiy with. said baekgage; aseurce of ight; and iight controi elements at eaoh seeeted stop positioncooperat-- ing with said photosens'tive member; said oon trol meaneineiuding a photo-sensitive member and a light source movaeiesynchmnousiy W h said back gauge; iight controi between said 1ightsouroe and said photo-sensitive member; elements on said 1ight con'tro1means permitting a passage of light a-nd otheralementsintercepting;1ight; at least certain boundaries between said elements ofoppositechara-cteristics being located at the stop positions oftheoaeirgangeand the photo-sensitve member.

4. A movable back gauge for a, cuttin oao'oine having a reciprocatingknife, drive app-a atus for stepping said back gange t') a pluraiity o;fpreselected successive positions, said apparatus including driveapparatus and an output conneetion between said drive. apparatus andsaid back gauge, controi means responsive to the approaoh of said backgauge to a seleoted position to reduce the speed of output connecton andsaid beek gange; said control means being responsive to the arrival ofthe beek gauge at seiected position to halt said back gange; saidcontrol means inciuding a photo sensitive member movaloie synchro nouslywith said back gauge; a sonrce. of iight; and light control eiements ateaoh se.ected position cooperating vvith said photo-sensitive member;said control means including a photoscnsitive member and a light souroemovable synchronously h said back gauge; ,ht control eiements at eachseie-eted stop osition cooperating with photosensitive member and said1ight souree to controi the impingement of 1ight upon said photmsenstivemember.

5. A moiable back gauge for a cutting machine havng a reoiprocatingknife, apparatns for steppi-ng said back ganse to a pluiaiity ofpre-selected Suocessive positiens; said apparatus inchzding a firstdriving,- motor, a second driving motor, a drive shaft conneeted to saidback gange and a transmission between said driving motors and saidshaft; means foy initiatin the operation of said motors simuiteneouslyin the Same dir ction to drive s aid shaft at relativelv high speed;control means responsive to the approaoh of said back gauge to a seeotedposition to reduce the speed of one of said motors to reduee the forwardspeed of said shaft and boek gauge, said ooncroi means being responsveto the arrivai of. the gauge at a seiected position te inat icc-thmotors: said control ineens including a ph.otosensi*ive member and aiigot souree mevabie synohronons- 1y with said back. auge: a stationaryopaque member between said light souree and said photosensitve member;openings in said opaqne membei at each successive stop position; circuitconnections oetween said photo-sensitive member and said drive motorresponsive to irnpingement of light on the photo-sensitive member tes1ovv sad drive shaft and responsive to suosequent i11- terception olight by said opaque member te hat said drive shaft, aod additionaimeans or initiating the movement of said back gauge foilovving a haltthereo-.

6. A movable back gauge r a cutting machine having a reciprocatingknife, apparatus for step ping said back gauge to a pluraiity ofpreselected sucoessive positions; said apparatus including a firstdriving motor, a second driving motor, a drive shaft conneeted to saidback gauge and a 10 traiismissionbetween said drvng motors and sadshaft; means for initiating the operation of said motors simultaneouslyin the same direction to drive said shaft at relativeiy high speed;controi means responsive to the approach of said back gaoge to aselected position to reduce the speed of one-01": said motors to reducethe forward speed of seid shaft and back gauge, said control means beingresponsive to the arrival of the back ganse at a .eiected position tohalt both motors; said transmission oomprising a pair of driven members;sun and planet geer connections between each driven member andsaidshaft, and ve conneetion between each motorand a driven member.

7. A movable back gauge for a cutting machine having a reciprocatingknife, apparatus for stepping said back gauge to a pluralty ofpreselected successive positions; said apparatus including a firstdriving motor, a second driving motor, 2, drive shaft connected to sadback gauge and a transmission between said driving motors and saidshaft; means for initiating the operation of said motors simultaneouslyin the same direction to drive said shaft at reiatively high speed;control means responsive to the approach of said back gauge to ase1ected position to reduce the speed of one of said motors to reducethe forvvard speed of said shaft and back gauge, said control meansbeing responsive to the arrval of the back gauge at a selected positionto halt both motors; said transmission comprising a pair of drivenmembers; sun and p1anet geer connections betvveen each driven member andsaid shaft, and a drive connection betvveen each motor and a drivenmember, and an over-running clutch connection between each driven memberand its sun and p1anet gear connection.

8. A movable back gauge for a cutting machine including drive apparatusfor forwardly driving said back gauge, and motion control means for saiddrive apparatus comprising a photo-sensitive device and a 1ight sourceto which it is responsve, includng a member therebetween adapted tocontrol 1ight from said light source to said photo-sensitive device, andmeans for providing relative motion between said member and the path of1ight from said light source to said photo-sensitive devicesynohronousiy with motion of said back gauge said member comprisingmeans ior intermittently permitting light to pass to saidphoto-sensitive device during the forward course of travel of said backgauge for intermittently stopping said driving source, whereby said backgauge is moved to a pluralty of forward successive positions asdetermined by said intermittent passing of light to said photosensitivedevice so as to position a stack of paper for successive cuts in lengthsdetermined by said successive positions.

9. A movab1e back gauge as set forth in claim 8, vvherein said membercomprises a body having opaque and non-opaque areas in alternativearrangement and disposd so as to successively pass through said path of1ight, the alternative positioning of said opaque and non-opaque areasbeing predetermined in accordance vvith the lengths of paper it isdesired to successively out.

10. A movable back gauge for a cuttin m chne ncluding drive apparatusfor forwardly driving said back gauge, and motion control means for saddrive apparatus comprising a photo-sensitive device and a light sourceto which it is responsive, including a member there- 11 between adaptedto contro1 11ght trom sad 1ight source to said photo-sensitve device,and means for provdng relatvmotion between sad member and the path of1ght from said ]ight source to sad photo-senstive device synchronouslywth motion of sad back gauge, sad member comprsing means forntermttently nterruptng and permittng the passage of lght to sadphotosenstve device at selected postons of sad back gauge orntermttently controllng said drvng source t o move and stop sad backgauge, whereby said back gauge is moved to a pluralty of forwardsuccessvepositon as determined by sad ntermittent passing of light tosad photo-senstve device so as to positon en steek of paper for 15 12successve cuts in lengths determned by sad successve postons.

FREDERICK W. SEYBOLD.

BEFERENCES CITED The follcwng references are of record in the fi1e ofths patent:

UNITED STATES PA'I'ENTS Number Name Date 1,270,028 Henderson June 18,1918 2,053,499 Seybold et al. Sept. 8, 1936 2,116593 Bouvier et al May10, 1938 2.487,931 Seybo1d Nov. 1, 1949

